Remove zuul-cloner usage in test scripts
Remove zuul-cloner usage in test scripts

We no longer need to keep Zuul v2 environments into account, and
Zuul v3 is already covered.

Change-Id: I6e93786f6f89bff2ee4c854984b625037bd63bbf

openstack-packages/DLRN,openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean